“More Activities” Not showing

Hi guys,

We’ve been using this plugin for some time now, and it worked perfectly but we detected that now, in the backoffice, it only lets you filter activities until July 2018, eventhough we have activities for agust and september.

And the button to show more classes is not working. You click on it and it does nothing. What can it be?

Thanks.

The page I need help with: [log in to see the link]